The phrase "where do you put up?" is an informal way of asking someone where they are staying or living, essentially inquiring about their place of residence. It is usually used in casual conversations among family, friends, or acquaintances to find out someone's current abode or lodging arrangements. For example, asking "Where do you put up?" means "Where are you staying?" or "Where do you live?"

The term "put up" in different contexts can have various meanings, such as to build or erect something, to struggle or resist, or to allow someone to stay temporarily (like "put you up for the night"). In the context of "where do you put up?" it specifically relates to lodging or staying somewhere temporarily or permanently.

Thus, "where do you put up?" is commonly understood as "where do you stay/live?" in informal spoken English.